I have a 64GB iPhone X. 1) I am wondering how long this phone will last until it gets out-dated/seem old. Do NOT take in to consideration about factors, such as how well I take care of the phone. 2) In comparison, how many years do you think it will take for the iPhone 8/8 Plus to get out-dated. 3) And, as of this year, which iPhone do you think got out dated. (I know some people upgrade every year or two, but that doesn't necessarily mean the phone is out-dated).